Ticket #24716: 24716.3.patch

src/wp-includes/media.php

@@ -2601 +2601 @@
                 $response['uploadedToTitle'] = $post_parent->post_title ? $post_parent->post_title : __( '(No title)' );
         }
 
-        $bytes = filesize( get_attached_file( $attachment->ID ) );
+        $file = get_attached_file( $attachment->ID );
+        $bytes = ( file_exists( $file ) ) ? filesize( $file ) : 0;
         $response['filesizeInBytes'] = $bytes;
         $response['filesizeHumanReadable'] = size_format( $bytes );